Boiler



(No Model.)

F. SAXON;

BOILER.

N0. 495,841 Patented Apr. 18, 1893.

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UNITED STATES- PATENT OFFICE.

FRANK SAXON, OF WORTI-IINGTON, MINNESOTA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 495,841, dated April18, 1893.

Application filed M-arch 24, 1892.

To all whom it may concern.-

Be it known that I, FRANK SAXON, of Worthington, in the county of Noblesand State of Minnesota, have invented a new and useful Improvement inBoilers, of which the following is a full, clear, and exact description.

My invention relates to an improvement in boilers, especially returnflue boilers for road or traction engines, or engines for agriculturalpurposes, and the object of the invention is to provide a frontextension to the boiler which will act in a manner to save the flamesheet and also that portion of the flue sheet of the boiler above thewater line.

It is another object of the invention, by means of the extension tosupply hot water through it constantly to the interior of the mainboiler, and to so construct the extension that it may be hinged to themain portion of the boiler so that the interior thereof may be disclosedwhen required, and whereby the .hinge employed to connect the front orextension with the main body of the boiler will be the supply anddischarge pipes. Thus the extension, whether closed or open, will notinterfere with the passage of water from the extension to the mainboiler.

Another object of the invention is to so 10- cate the discharge pipe inthe front or extension that when the boiler is placed in an inclinedposition the water will not discharge itself altogether from theextension or front into the main boiler; and a further object of theinvention is by the addition of the front or extension to the boiler toobtain a maximum of the heat in a return fire tubular boiler.

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter fully set forth and The extensionA, of the boiler B, is located Serial No. 26379. (No model.)

at the front, and is of less diameter than the diameter of the frontportion of the boiler, the extension being made of such size that itsinner end will fit within the shell of the boiler projecting beyond theflue sheet 10, the projection of the shell being designated as 11 in thedrawings. The extension is provided with a circular water chamber 12,and this chamber is produced by forming within the extension an innerhead 13, which extends downward from the top of the extension parallelwith the fine sheet of the boiler above the fire tube 14., as shown inFig. l. The partition is then carried diagonally downward to form aflame sheet 15, and thence verticallydownward producing a Water leg 16;and around the opening 17, formed in the front or outer face of theextension and adapted to be covered by a suitable door, the lowerportion of the partition extending to the inner edge of the shellthereof. formed, of greater width at the top than intermediate of thetop and bottom, this difference in width being created in order to formwithin the chamber a combustion chamber 0, as is likewise shown in Fig.1; and the walls of the water chamber are braced by a series of tie rods18, arranged in any approved manner, and in the flame sheet 15 of theboiler, a plug 19, is located, while a plug 20, is also placed in theflue sheet of the boiler. These plugs are hollow and filled with afusible metal, so that in the event of low water the fusible metalmelts, and the remaining water and steam in theboiler will then bedischarged upon the fire and extinguish it.

The front or extension has a hinge connection with the main body of theboiler, and this connection is effected jointly through the medium ofthe vertical portions of the'water supply tube 21 and discharge tube 22,as the knuckles 23 of the hinges are connected one knuckle with the mainbody of the boiler and the other with the extension, the pipes or tubespassing through the knuckles as shown best in Fig. 3.

The vertical sections of the supply and of the discharge tubes or pipesare connected preferably to the lower hinge through the medium'of aunion coupling 24, this coupling being divided into an, upper and alower compartment through the medium of a central Thus a circular waterchamber is partition 25, the compartments being independent; and thelower end of the upper tube, which is the supply tube, has a swivelconnection with the upper end of the union coup ling, while the upperend of the discharge tube, which is the lower tube, is connected in likemanner with the lower end of said coupling, as is likewise best shown inFig. 3.

Above the upper hinge of the front, the supply tube 21, is connected byapipe 26, with a pump, or with any apparatus capable of supplying waterto it, the connection between the pipe 26 and the tube 21 being a swivelone, and in the drawings is represented as effected by a union 27. Thevertical portion of the discharge pipe or tube has also a swivelconnection with the lower horizontal branch 28, the said branch leadinginto the main body of the boiler. Water is supplied to the chamber 12 inthe front or extension by a branch supply pipe 29, connected with theupper compartment of the coupling union 24, and with the water chamber12 in the extension, at or near the center of one side.

Water is fed from the water chamber of the extension to the dischargepipe 22, through the medium of a supply branch 30, which is connectedwith-the lower compartment of the water chamber thereof, and againvertically upward, forming a stand pipe 31, as shown in Fig. 1, the saidstand pipe at its top being but slightly spaced from the upper wall of.

the extension. Thus it will be observed that the water line which is tobe established in the extension is considerably higher than that to bemaintained in the main boiler, the two water lines being indicated bydotted lines in Fig. 1.

The front of the extension is usually provided with hand holes 32, forcleaning the interior thereof, and a latch 33 of any approvedconstruction is adapted to lock the extension to the shell of the mainboiler. This lock or latch is usually made at the side opposite that atwhich the hinge is located and near the top. It will be understood thatby entering the inner end of the extension within the front of the shellof the main boiler, this portion of the shell will maintain the burdenof the weight of the extension and thus relieve the hinges from unduestrain, thus "necessitating only a simple form of lock or latch.

It will be observed that when the extension is attached to the boiler,the flame sheet 15, is eifectually protected, and likewise the fluesheet 10, and that water is first supplied to the extension where itbecomes heated, and when the extension chamber has been filled it flowsthrough the stand pipe 31 and through the discharge pipes 30 and 28 intothe boiler in a heated condition; and it will be likewise observed thatin the event the boiler is standing upon an incline, or is being carriedup or down a hill, the water in the extension chamber can not possiblyleave it to such an extent as to dangerously expose its walls to heat,and that a certain per-cent only of the water will pass from theextension chamber to the main body of the boiler when the supply ofwater to the extension has been shut off.

The prime object to be attained by my invention is to provide a maximumamount of heating surface, and to economize in fuel.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination, with a boiler, of an extensionlocated in front of the flue sheet, the said extension being providedwith an interior water chamber extending from top to bottom, the saidchamber being circular and of less diameter at its central portion thanat the top whereby a combustion chamber is formed, a stand pipe locatedwithin the water compartment of the extension, apipe connection betweenthe stand pipe and the water receiving section of the boiler, and'awatersup ply connected with the water chamber of the extension, as and forthe purpose set forth.

2. The combination, with a boiler, of an extension located in front ofthe flue sheet and combustion chamber, the said extension being providedwith awater chamber extending from top to bottom, of less diameter atits central portion than at the top, forming an interior compartmentadapted as an extension of the combustion chamber of the boiler, atubular hinge connection between the extension and the boiler, a portionof the tubular hinge being adapted to convey water to the extension ofthe boiler and another portion to conduct water from the extension tothe main boiler, substantially as and for the purpose set forth.

3. The combination, with a boiler provided with a projected flange atits front, of an extension located at the front, fitting within theflange and extending outwardly therefrom, the said extension beingprovided with an interior circular water compartment extending from topto bottom and from side to side, the said water compartment being ofless diameter at its central portion than at its upper end, forming aninterior combustion chamber adapted as a continuation of that of theboiler, hinges connecting the extension with the main boiler, thepintles of which hinges consist of tubes, one tube being provided with aswivel connection at one end with a watersupply apparatus, and connectedat its oppoposite end with a branch leading into the water chamber ofthe extension, the other pintle tube having a swivel connection at oneend with a discharge pipe leading into the boiler and connected at itsopposite end with a stand pipe located within the water chamberof theextension, all combined to operate substangialy in the manner and forthe purpose speci- 4:. The combination with a boiler, of an extensionprovided with a circular water chamber extending from top to bottom andof less diameter at the central portion than at the top, thereby forminga combustion chamber, said extension being hinged to the boiler,substantially as described.

5. The combination with a boiler, of an extension provided with acircular water chamber extending from top to bottom and of less diameterat the center than at the top thereby IO forming a combustion chamber,the said extension being hinged to the boiler by the supply anddischarge pipes thereof, substantially as described.

FRANK SAXON. Witnesses:

PETER THOMPSON, P. G. J OHNSON.

